不同位置和尺寸的裂隙对岩体破坏影响的试验研究

doi:10.13722/j.cnki.jrme.2014.0336

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摘要为研究节理裂隙岩体中节理位置和尺寸对岩体综合抗剪强度的影响，以水泥砂浆作为模型材料，通过在试件的不同位置预制相同长度的节理裂隙和相同位置预制不同长度的节理裂隙，进行不同法向压力下3种具有不同起伏角的节理面剪切试验。试验结果表明：当节理位置和长度一定时其抗剪强度随法向压力增加而增加；对于同一节理裂隙，当其位于试件中间时抗剪强度和黏聚力最小，位于试件后端时抗剪强度和黏聚力最大，位于试件前端时介于两者之间；内摩擦角随节理位置的变化规律不明显；当节理裂隙位置固定时，节理裂隙越长，抗剪强度和黏聚力越低，且抗剪强度随节理长度的增加呈近乎线性的减小。节理位置和尺寸对综合抗剪强度的影响可能由于节理、岩桥的强度参数及岩桥内部损伤劣化程度共同作用所致，现场节理岩体的抗剪强度取值应考虑节理的位置影响。

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关键词 ：岩石力学, 节理裂隙, 节理位置, 尺寸, 抗剪强度, 岩桥劣化

Abstract：In order to study the effects of joint location and size on comprehensive shear strength of rock mass，cement mortar is selected as model material and specimens were prepared with prefabricated joints of the same size at different locations and with joints of various sizes at the same location，and shear tests were conducted under various normal stress of 3 different joints undulating angles. Experimental results indicate that shear strength increases with the increase of normal stress when the location and size of the joint are definite，and when the joint is located in the middle of the specimen，the shear strength and cohesion are the lowest，while largest when the joint is located at the back and fall in between them when located in the front of the specimen，but change law of the internal friction angle with different joint location is not obvious. When the joint location is definite，the longer the joint the lower the shear strength and cohesion. Moreover，shear strength of joint decreases linearly with increase of joint length. Effects of joint location and size on comprehensive shear strength of rock mass may be decided by both the strength parameters of joint and rock bridge and damage degradation of rock bridge. Position of joint should be considered when shear strength of in-situ jointed rock mass is estimated.

Key words： rock mechanics rock joint joint location size shear strength rock bridge degradation

引用本文:

周辉，孟凡震，张传庆，卢景景，徐荣超. 不同位置和尺寸的裂隙对岩体破坏影响的试验研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3018-3028.
ZHOU Hui，MENG Fanzhen，ZHANG Chuanqing，LU Jingjing，XU Rongchao. EXPERIMENTAL STUDY ON EFFECT OF JOINTS WITH DIFFERENT LOCATIONS AND SIZES ON ROCK FAILURE. , 2015, 34(s1): 3018-3028.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0336 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3018

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